Inserted-blade cutter



Nov. 19, 1929. F. P. MILLER INSERTED BLADE CUTTER 5 2 9 l 6 1 V. a M d el 1 F INVENTOR i'ralzfi;

AQIEY v old Patented Nov. 19, 1922 rarest: OFFICE minim VP. MILLER, orMEADVILLE, PENNSYLVANIA INSERTIlD-BLADE CUTTER Application filed May 16,

This invention relates to rotary cutters of the inserted blade type andhas for an important object the provision of simple means whereby theblades may be firmly locked in the slots which receive the bladeswhereby shifting of the blades as a result of use is prevented.

More specifically, the invention forming the subject matter of thisapplication aims to provide a rotary cutter in which the blades andwedging members thereof are provided with interfitting serrations whichgradually deepen toward their outer ends whereby the outward shifting ofthe blades with respect ]5 to the wedging members is effectivelyresisted.

A further object is to provide an inserted blade rotary cutter which maybe easily adjusted and which by reason of the simplicity in design willmeet with commercial favor when placed upon the market.

Other objects and advantages will be apparent during the course of thefollowing description.

In the accompanying drawing forming a part of this application and inwhich like numerals are employed to designate like parts throughout thesame,

Figure 1 is a fragmentary perspective of a milling cutter embodying theinvention;

Figure 2 is a detail sectional view through the milling cutter, one ofthe blades, and the holding means therefor;

Figure 3 is a fragmentary plan view illustrating one of the blades andthe holding means therefor;

Figure 4 is a group perspective illustrating one of the blades and theholding means therefor. r

In the drawing wherein for the purpose of illustration is shown apreferred embodiment of the invention, the numeral 5 designates amilling cutter or other body having slots 6 opening out through theperiphery thereof for the reception of work engaging blades 7.-

Figure 4 plainly illustrates that one side 1925. Serial No. 30,784.

blade 7. More specifically, the serrations 10 and 11 are gradually anduniformly increased in depth toward the outer ends thereof so that Whenthe serrations are in interfitting relation as shown in Figure 3,outward movement of the blade will be prevented.

The wedging member 9 is provided with an opening 14, the intermediateportion of which is provided with a shoulder for engagement by the headof a cap screw 20. It

will be seen that when the cap screw 20 is extended through the opening14 and into a socket,22 and tightened therein the wedging member willhave firm locking engagement with the blade.

Figure 4 plainly shows that the outer portion of the blade is sharplyreduced in thickness as indicated at 26 to simplify the cutting of theserrations 11.

Figure 2 illustrates that each socket 8 has ample depth to permit of themovement of the semi-circular wedging member inwardly to its fullestextent. That is to say, the tightening of the cap screw 20 will notresult in the engagement of the wedging member 9 with the bottom wall ofthe socket 8.

The head of the tightening member 20 is shown as being provided with agroove for the reception of the forward end of a screw driver, but it isobvious, of course, that the head may be provided with any suitable toolengaging means.

Having thus described the invention, what is claimed is:

1. A rotary cutter comprising a body having a slot and a socket in oneside wall of said slot, a blade in said slot, a wedging member in saidsocket, said blade and said wedging member being provided withinterfitting approximately radial serrations deepened toward the endsthereof.

2. A cutter comprising a carrier having a slot and a socket in one wallof said slot, a

' blade in said slot, a wedging member in said socket, said blade andsaid Wedging member being provided with interfitting serrationsgradually increasing in depth toward the outer ends thereof to resistoutward shifting of the blade.

3. A rotary cutter comprising a carrier.

having a slot and a socket in one wall of said slot, a blade in saidslot, a wedging member in said socket, said blade and said wedgingmemberbeing provided with interfitting serrations graduallyincreasing in depthtoward the outer ends thereof to resist outward shifting of the blade,and a screw extending through said wedgingmember and having threadedengagement with. said carrler.

4:; The construction set forth in claim 3, the

outerportion of said blade being sharply reduced at the'point where theserrations on the blade terminate.

5. A rotary cutter comprising a carrier having a slot and anapproximately radial rier and having a head engaged with said shouldertodraw said wedging member inwardly into firm binding engagement with Isaid blade.

6. A rotary cutter comprising a body, a

- .wedging member and a blade carried by the body'and having theopposedsurfaces thereof providedwith interfitting, gradually deepeningserrations to resist displacement of the blade.

7. A cutter comprising a holder, and; a

blade associated with the holder, said blade and said holder beingprovided with interfitting serrations extending in the same directionand deepened toward the ends thereof to hold the blade against shifting.

8. A cutter comprising a holder, a blade associated with the holder andhaving an outer edge, the holder andthe blade being provided withinterfitting serrations increased in cross sectional area toward theouter ends thereof to resist shifting of the blade.

9. In a cutter, a pair of cooperating members having interfittingserrations extending in thesame direction and deepened in the samedirection to resist movement of one of the members with respect to theother memher in the direction in which the serrations extend. p

In testimony whereof I atfix my signature.

FRANK P. MILLER.

